This article reviews bearingless motor technology for medium and high power applications. Historically, bearingless motors have resided in research settings and certain niche commercial applications. Significant literature has been dedicated to developing designs that feature highly specific geometry, restricted by applications with a unique set of needs, oftentimes with low power requirements. The first part of this article reviews existing and potentially new use-cases of magnetic levitation in transportation and industrial applications. The second part of the article reviews bearingless motor technology for these applications, presents a comprehensive literature review of prototype test results, and highlights efforts to generalize and increase the power rating of bearingless motor technology. The final part of this article derives sizing equations of different bearingless motor topologies, which are summarized as a design tool for developing industrial-scale bearingless motor technology.

中文翻译：

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大功率应用的无轴承电机技术回顾

本文回顾了适用于中高功率应用的无轴承电机技术。从历史上看，无轴承电机一直存在于研究环境和某些利基商业应用中。大量文献致力于开发具有高度特定几何形状的设计，这些设计受到具有一组独特需求的应用的限制，通常具有低功率要求。本文的第一部分回顾了磁悬浮在交通和工业应用中的现有用例和潜在的新用例。文章的第二部分回顾了这些应用的无轴承电机技术，对原型测试结果进行了全面的文献综述，并强调了推广和提高无轴承电机技术额定功率的努力。